Those who are happy with their sex lives are having sex once or twice a week on average, and those who are unhappy with their sex lives are having sex less than once or twice a month.

Kiwis would like to be having sex two to three times a week, and more than half of New Zealanders agree that great sex is key to a happy relationship.

People living in Hamilton are having the most sex (three or more times a week on average), while people living in Tasman, Nelson and Marlborough are having the least sex - three times a year or less on average.

However, having the most sex doesn't necessarily equal sexual satisfaction. Hawke's Bay is ranked the most sexually satisfied region, where people are having sex once or twice a week on average.

Otago is the least sexually satisfied region, and residents are having sex once a week on average.

The average unsatisfied Kiwi is likely to be aged between 35 and 39, and "unconfident with their sexual performance". One in six Kiwis have sex less than once a year, and one in six people think their sex life is monotonous and boring.